linux-kernel - Re: [PATCH v2 05/18] reset: Add reset_controller_of

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Date:	Tue, 10 Mar 2015 16:28:44 +0100
From:	Maxime Coquelin <mcoquelin.stm32@...il.com>
To:	Arnd Bergmann <arnd@...db.de>, maxime.ripard@...e-electrons.com
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Andreas Färber <afaerber@...e.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robh+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>, Antti Palosaari <crope@....fi>,
	Tejun Heo <tj@...nel.org>, Will Deacon <will.deacon@....com>,
	Nikolay Borisov <Nikolay.Borisov@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Kees Cook <keescook@...omium.org>,
	Michal Marek <mmarek@...e.cz>,
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	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
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	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 05/18] reset: Add reset_controller_of_init() function

2015-03-10 16:00 GMT+01:00 Arnd Bergmann <arnd@...db.de>:
> On Friday 20 February 2015 19:01:04 Maxime Coquelin wrote:
>> Some platforms need to initialize the reset controller before the timers.
>>
>> This patch introduces a reset_controller_of_init() function that can be
>> called before the timers intialization.
>>
>> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@...il.com>
>>
>
> Not sure about this. It seems like the cleanest approach if we get
> a lot of these, but then again it is probably very rare, and I'd
> like to avoid adding such infrastructure if it's just for one
> SoC. Could we add a hack in the machine initialization instead?

Sun6i also need to initialize the reset controller early. Today, they
hack the machine initialization.
With two SoCs having the same need, what should we do?

That said, I'm fine with either way. If reset_controller_of_init gets
accepted, I will send the patch for sun6i.

>
> I think ideally this would be done in the boot loader before we
> even start Linux, but I don't know if that's possible for you.

>From what I understand, the only constraint is to perform it after the
clock is enabled.
So this should be possible to do it in the bootloader, but it means
also adding timers clocks ungating in the bootloader.

Br,
Maxime

>
>         Arnd
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